I wonder if it's a coincidence how both best ponies' recolours are white with blonde hair...hmm...In any case, the original pose I had in mind for this was much more action-y, but I had to give up on complexity so I can get it done in the allotted hour. Also, the posing was somewhat weird which caused the Banner Mare to look like she's missing her far hindleg (but she's not!)

Could be, but I think that's getting into over-thinking the show. (as much as I love doing that ) Fact is, Fluttershy has a pretty elegant hairstyle and they only needed the banner mares for a few seconds in the episode. I guess it wasn't worth the time to make some unique designs.